<![CDATA[How to use VOXL2 J19 Port for Serial Communication]]>Hello,

I'm trying to communicate via Serial communication on port J19 on the VOXL2. Currently I can open a port on the corresponding interface (/dev/ttyACM0) but I cannot read or write any data. This is how I currently wired my serial device to this port, do you have any recommendations or insight on I can open serial communication on this port?

I do not have any GPS or magnetometer connected to the drone at those ports.

The table contains the pins of the device I am connecting the J19 port, and the lines are the left are what pins on the J19 port I am connecting them to.
I also tried swapping the wire at pin 8 to pin 3, and pin 7 to pin 2 of the J19 port to try and take advantage of the GPS's communication lines, but this didn't work either.

Screenshot from 2023-02-16 18-31-49.png

Relevant link: https://docs.modalai.com/voxl2-connectors/#j19---external-sensors-2x-uart-2x-i2c

Screenshot from 2023-02-16 18-32-13.png

]]>https://forum.modalai.com/topic/1844/how-to-use-voxl2-j19-port-for-serial-communicationRSS for NodeSun, 12 Jul 2026 00:19:42 GMTFri, 17 Feb 2023 02:43:58 GMT60<![CDATA[Reply to How to use VOXL2 J19 Port for Serial Communication on Sat, 18 Feb 2023 16:11:58 GMT]]>The J19 connector is specfically connected to the sDSP, so that particular connector yes, but we have other apps_proc interfaces for UART/I2C/SPI/GPIO.

This is where it's likely easiest to locate where the interfaces are:
https://docs.modalai.com/voxl2-linux-user-guide/

VOXL2 has been optimized for size, and thus some/most of these interfaces require some kind of connector that is likely harder than just making a JST cable real quick to test something out, or a daughter card that exposes it on a JST.

]]>https://forum.modalai.com/post/8590https://forum.modalai.com/post/8590Sat, 18 Feb 2023 16:11:58 GMT<![CDATA[Reply to How to use VOXL2 J19 Port for Serial Communication on Fri, 17 Feb 2023 23:57:14 GMT]]>@Eric-Katzfey

Just adding to this thread. Is the only way to connect external sensors to the Linux processor through the USB ports on the Microhard add on board? And I2C is not possible?

]]>https://forum.modalai.com/post/8583https://forum.modalai.com/post/8583Fri, 17 Feb 2023 23:57:14 GMT<![CDATA[Reply to How to use VOXL2 J19 Port for Serial Communication on Fri, 17 Feb 2023 15:35:36 GMT]]>@Daniel-Ryu These ports are mapped to the DSP where the PX4 flight control software runs. These ports are not available for use by the Linux processor.

]]>https://forum.modalai.com/post/8569https://forum.modalai.com/post/8569Fri, 17 Feb 2023 15:35:36 GMT